Influence of light availability on the specific density, size and sinking loss of <i>Anabaena flos-aquae</i> and <i>Scenedesmus obliquus</i> -- Journal of Oceanology and Limnology,2018,36(4):1053-1062

	Cite this paper:
	HUANG Yingying, ZHANG Haichun, GAO Rufeng, HUANG Xiaochen, YU Xiaojuan, CHEN Xuechu. Influence of light availability on the specific density, size and sinking loss of Anabaena flos-aquae and Scenedesmus obliquus[J]. Journal of Oceanology and Limnology, 2018, 36(4): 1053-1062

Influence of light availability on the specific density, size and sinking loss of Anabaena flos-aquae and Scenedesmus obliquus

HUANG Yingying¹, ZHANG Haichun², GAO Rufeng³, HUANG Xiaochen⁴, YU Xiaojuan⁵, CHEN Xuechu^1,5

1 Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China;
2 Shanghai Environmental Monitoring Center, Shanghai 200235, China;
3 Shanghai Administration Center for Ocean Affairs, Shanghai 200050, China;
4 East Sea Information Center of State Oceanic Administration People's Republic of China, Shanghai 200137, China;
5 School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Abstract:

Harmful algal blooms in eutrophic waters pose a serious threat to freshwater ecosystems and human health. In-situ light availability control is one of the most commonly used technologies to suppress algae in lakes and reservoirs. To develop a better understanding of the effects of light on algal growth, specific density, colony size and sinking loss, Anabaena flos-aquae (cyanobacteria) and Scenedesmus obliquus (green algae) were evaluated in varying light scenarios. The results showed that the specific density and colony size of these two species varied during growth, and there were obvious differences among the light scenarios. At the end of exponential phase, S. obliquus incubated under light-limited condition maintained a higher specific density and formed larger aggregates, whereas A. flos-aquae formed a longer filament length. Both species exhibited higher sinking loss rates with lower light availability. These results implied that the sinking loss rate was not always constant but should be considered as a variable response to the change of light availability, and in-situ light availability control might result in a significant increase of the sinking loss of algae due to the change of size and specific density, thereby further affecting the algal biomass in the water column.

Key words: specific density|size|light availability control|sinking loss

Received: 2017-06-08 Revised:

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